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                            ~~~
/**
 * utf8轉gbk
 * @param $utfstr
 */
function utf8_to_gbk($utfstr) {
   global $UC2GBTABLE;
   $okstr = '';
   if(empty($UC2GBTABLE)) {
      $filename = CODETABLEDIR.'gb-unicode.table';
      $fp = fopen($filename, 'rb');
      while($l = fgets($fp,15)) {        
         $UC2GBTABLE[hexdec(substr($l, 7, 6))] = hexdec(substr($l, 0, 6));
      }
      fclose($fp);
   }
   $okstr = '';
   $ulen = strlen($utfstr);
   for($i=0; $i<$ulen; $i++) {
      $c = $utfstr[$i];
      $cb = decbin(ord($utfstr[$i]));
      if(strlen($cb)==8) { 
         $csize = strpos(decbin(ord($cb)),'0');
         for($j = 0; $j < $csize; $j++) {
            $i++; 
            $c .= $utfstr[$i];
         }
         $c = utf8_to_unicode($c);
         if(isset($UC2GBTABLE[$c])) {
            $c = dechex($UC2GBTABLE[$c]+0x8080);
            $okstr .= chr(hexdec($c[0].$c[1])).chr(hexdec($c[2].$c[3]));
         } else {
            $okstr .= '&#'.$c.';';
         }
      } else {
         $okstr .= $c;
      }
   }
   $okstr = trim($okstr);
   return $okstr;
}
~~~
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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